Werk #6323: Fixed graph PNG export of other than first graphs

Component	Metrics system
Title	Fixed graph PNG export of other than first graphs
Date	Jul 3, 2018
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b1 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b1 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b1 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b1 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b1 Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0b8 Checkmk Enterprise (CEE), Checkmk MSP (CME)

When using the PNG export of a graph (e.g. from the context menu of a graph), only the export of the first graph of a host/service was working. Other graphs produced an error message.

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